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From Bastian Köcher (JIRA) <j...@apache.org>
Subject [jira] [Created] (FLINK-922) coGroup ordering NullPointerException
Date Wed, 11 Jun 2014 12:29:01 GMT
Bastian Köcher created FLINK-922:
------------------------------------

             Summary: coGroup ordering NullPointerException
                 Key: FLINK-922
                 URL: https://issues.apache.org/jira/browse/FLINK-922
             Project: Flink
          Issue Type: Bug
    Affects Versions: pre-apache-0.5
            Reporter: Bastian Köcher


I'm running a delta iteration and want to execute an coGroup on the solutionset but I'm getting
a NullPointerException.

Here is the stacktrace: 
java.lang.NullPointerException
	at eu.stratosphere.compiler.operators.CoGroupDescriptor.instantiate(CoGroupDescriptor.java:131)
	at eu.stratosphere.compiler.dag.TwoInputNode.instantiate(TwoInputNode.java:555)
	at eu.stratosphere.compiler.dag.TwoInputNode.addLocalCandidates(TwoInputNode.java:523)
	at eu.stratosphere.compiler.dag.TwoInputNode.getAlternativePlans(TwoInputNode.java:453)
	at eu.stratosphere.compiler.dag.SingleInputNode.getAlternativePlans(SingleInputNode.java:251)
	at eu.stratosphere.compiler.dag.WorksetIterationNode.instantiate(WorksetIterationNode.java:308)
	at eu.stratosphere.compiler.dag.TwoInputNode.addLocalCandidates(TwoInputNode.java:523)
	at eu.stratosphere.compiler.dag.TwoInputNode.getAlternativePlans(TwoInputNode.java:453)
	at eu.stratosphere.compiler.dag.DataSinkNode.getAlternativePlans(DataSinkNode.java:192)
	at eu.stratosphere.compiler.PactCompiler.compile(PactCompiler.java:715)
	at eu.stratosphere.compiler.PactCompiler.compile(PactCompiler.java:553)
	at eu.stratosphere.client.LocalExecutor.executePlan(LocalExecutor.java:216)
	at eu.stratosphere.api.java.LocalEnvironment.execute(LocalEnvironment.java:57)
	at eu.stratosphere.api.java.ExecutionEnvironment.execute(ExecutionEnvironment.java:520)

And here is my code I use to call the coGroup:
DeltaIteration<Document, ClusterPair> iteration = documents.iterateDelta(similarities,
10000, 1);
		
        DataSet<ClusterPair> linkageSet = iteration.getWorkset().reduce(new MinRed());

        DataSet<Document> delta = iteration.getSolutionSet().coGroup(linkageSet).where(0).equalTo(1).with(new
PointUpdater());



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